Hi. I am having issues with connecting iPad mini retina Wi-Fi+Cellular to 3G and 2G networks. I am able to connect it to LTE, has 3-4 bars of signal. Disabling LTE in settings it gives "No Service". I am not sure if that happened with digitizer replacement because I did not test it before repair. May it be cellular antennas issue? I have tried everything software related: resetting network settings, rebooting, taking sim out. Also, currently it is running iOS 9.2 beta, but that existed in public 9.1 as well. Any ideas?